import io.data2viz.color.* import io.data2viz.geom.* import io.data2viz.math.* import io.data2viz.viz.* import io.data2viz.random.* import kotlin.math.sqrt private val vizWidth = 600.0 private val vizHeight = 600.0 private var center = Point(vizWidth / 2, vizHeight / 2) private val randomAngle = RandomDistribution.uniform(.02, 2 * PI) private val randomDistance = RandomDistribution.uniform(1.1, 4.0) private val randomDepth = RandomDistribution.uniform(0.4, 1.0) private val randomRadius = RandomDistribution.exponential() private var frame = .0 data class Star(val visual: CircleNode, var radius: Double, var angle: Angle, var distance: Double, val depth: Double) private var totalStars = 2000 private lateinit var galaxy: GroupNode private lateinit var stars: List<Star> fun main() { viz { size = size(vizWidth, vizHeight) rect { width = vizWidth height = vizHeight fill = Colors.Web.black } galaxy = group { stars = (0 until totalStars).map { val angle = randomAngle().rad val starDis = randomDistance() * randomDistance() * randomDistance() val starDepth = randomDepth() val starPos = Point(starDis*angle.cos, starDis*angle.sin) var starRadius = 0.1 + (randomRadius() * sqrt(starDepth) / 1.3) Star( circle { x = starPos.x y = starPos.y radius = starRadius fill = Colors.Web.white.withAlpha((starDepth*120).pct) }, starRadius, angle, starDis, starDepth ) } } animation { frame += 0.05 galaxy.apply { transform { translate(center.x + (15 * frame.rad.sin), center.y + (10 * (frame / 1.3).rad.cos)) } } stars.forEach { star -> star.distance *= 1.0 + (sqrt(star.distance) * star.depth / 200.0) star.angle += (star.depth / 1.5).deg val starX = star.distance * star.angle.cos val starY = star.distance * star.angle.sin val alpha = star.depth * star.distance star.visual.x = starX star.visual.y = starY if (alpha <= 102) star.visual.fill = Colors.Web.white.withAlpha(alpha.pct) star.visual.radius = star.radius * (sqrt(star.distance) / 10.0) if (starX < -center.x || starX > center.x || starY < -center.y || starY > center.y) { star.distance = randomDistance() * randomDistance() star.radius = 0.1 + (randomRadius() * sqrt(star.depth) / 1.3) star.angle = randomAngle().rad } } } }.bindRendererOnNewCanvas() }